백준 25304번 자바 - 영수증

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        int bill = scanner.nextInt();
        int x = scanner.nextInt();
        int sum = 0;

        for (int i = 0; i < x; i++) {
            int a = scanner.nextInt();
            int b = scanner.nextInt();
            sum = sum +a * b;
        }
        if (bill == sum) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    }
}